I've used plaster lathe for ramps, coated the top of the water with sunflower seeds, to get the chipmunks mostly, works well but the water level has to be 1/2, tad under 2/3 or so. Seeds sink though, but mice go for it too, what you have there is even better.
These darned whitefooted mice got in my house again, I had an annoying one in my bedroom. He'd come out about 1am on the dot, so I put a live victor trap out, that s.o.b. got in the trap took the bait and would chow on it nearby, flash the lights on, he scatters, I look the trap over, just not possible, or so it seems, I've had other ones work just fine. Tick me off, I go downstairs and pull a pair of snap traps off the shelf, put those out, after he's woke me up, well now he's well fed, next night, I'm not home early, dark for a long while, figured I'd get him, being
silent and dark, nope he waits til 1:00 am ! I had nothing good for bait, but used a crouton from turkey stuffing, moist, worked just fine. I don't know whats up with the live trap, reason I thought they were good was multiple catches, I did see a small mole go in one, and come out, thought they eat earthworms, seems those victor live traps from tsc are not so good, still cannot believe that one in my room, I've caught too many in this house with the same traps, how in heck this guy could get in and get out is hard to figure, there is not enough space to get his head in, darned things are relentless around here too, time for a couple of those buckets outside and downstairs to see what those other traps are missing !